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Question

Hill used a dye for his famous hill reaction is

A
Sulphur green
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B
Eosine
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C
Methylene blue
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D
Dichlorophenol indophenol
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Solution

The correct option is C Dichlorophenol indophenol
In the year 1937 and 1939, Robert hill studied the light dependent reaction and revealed that oxygen evolved during photosynthesis came from water. In his experiment, he used Dichlorophenolindophenol (DCPIP) as a redox dye to measure the rate of photosynthesis. The dye is blue in oxidized state with a maximal absorption at 600 nm whereas in reduced, DCPIP is colourless.

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